A Primary Teacher near Liverpool explains to her class that she is a Liverpool fan.

She asks her students to raise their hands if they too are Liverpool fans.
Everyone in the class raises their hand except one little girl.
The teacher looks at the girl with surprise and says, 'Mary, why didn't you raise your hand?'
'Because I'm not a Liverpool fan,' she replied.
The teacher, still shocked, asked, 'Well, if you are not a Liverpool fan, then who are you a fan of?'
'I am a Man Utd fan, and proud of it,' Mary replied.
The teacher could not believe her ears. 'Mary, why, pray tell, are you a Man Utd fan?'
"Because my mum is a Man Utd fan, and my dad is a Man Utd fan, so I'm a Man Utd fan too!'
'Well,' said the teacher in an obviously annoyed tone, 'that is no reason for you to be a Man Utd fan.
You don't have to be just like your parents all of the time What if your mum was a prostitute and your dad was a drug addict, what would you be then?'